That is the feeling of going beyond your "normal" senses. It happens when you go beyond anything, not just power. Then you get used to it and your measuring stick of life gets a little bit longer. There is a sense of scale to everything perceived, and for most of us, the measuring device we have created by our own experiences is vastly skewed and vastly limited.

Go ride around town slowly in a race car and you'll get nice and nauseous too. The sensation will way beyond what your mind thinks should happen. Then...you just get used to it.